我这里写了一个单个文件上传的例子，但不知道怎么弄成多个上传，而且可以判断文件是否重复。`<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

 
  

  

  
springMVC包装类上传文件
   
  
    
  
          
    
  
      
      






Click To Upload

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@Controller
@RequestMapping("file")
public class FileController {
    private final static String UPLOAD="E:/file/upload/";
    
    @RequestMapping("file")
    public String toFileJsp(){
        return "upLoadFile";
    }
    
    @RequestMapping("upload2")
    public String uploadTwo(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException {
        //创建一个通用的多部分解析器
        CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(request.getSession().getServletContext());
        //判断 request 是否有文件上传,即多部分请求
        if(multipartResolver.isMultipart(request)){
            //转换成多部分request
            MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
            MultipartHttpServletRequest multiRequest = resolver.resolveMultipart(request);
            //MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
            //取得request中的所有文件名  
            Iterator iterator=multiRequest.getFileNames();
            while(iterator.hasNext()){
                //记录上传过程起始时的时间，用来计算上传时间
                int startTime=(int)System.currentTimeMillis();
                //取得上传文件
                MultipartFile file=multiRequest.getFile(iterator.next());
                if(file!=null){
                    
                    //取得当前上传文件的文件名称
                    String fileName=file.getOriginalFilename();
                    //如果名称不为“”,说明该文件存在，否则说明该文件不存在 
                    if(fileName.trim() != ""){
                        System.out.println("文件名为："+fileName);
                        //定义上传路径 
                        String path="E:/file/"+fileName;
                        File localFile=new File(path);
                        file.transferTo(localFile);
                    }
                }
                //记录上传该文件后的时间
                int endTime=(int)System.currentTimeMillis();
                System.out.println("所用时间为："+(endTime-startTime));
            }
        }
        return "success";
    }
    
    @RequestMapping(value="uploadFile",method=RequestMethod.POST)
    @ResponseBody
    public Respon uploadFile(HttpServletRequest request){
        
        MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        MultipartHttpServletRequest req = resolver.resolveMultipart(request);
        Respon respon=new Respon(Constant.CODE_ERROR,Constant.CODE_ERROR_STRING);
        MultipartFile file=req.getFile("avatar");
        if(file.getSize()>10*1024*1024){
            respon.setMsg("文件不得超过10M");
            return respon;
        }
        String fileName=file.getOriginalFilename();
        if(fileName.lastIndexOf(".")==-1){
            respon.setMsg("文件异常");
            return respon;
        }
        String ext=fileName.substring(fileName.lastIndexOf("."));
        List list=Arrays.asList(new String[]{".png",".jpg",".jpeg",".bmp"});
        if(!list.contains(ext.toLowerCase())){
            respon.setMsg("文件格式不允许");
            return respon;
        }
        //String base=request.getSession().getServletContext().getRealPath("/");
        SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
        String newName=sdf.format(new Date())+"-"+UUID.randomUUID().toString()+ext;
        //String parentPath=base+UPLOAD;
        String parentPath=UPLOAD;
        File f=new File(parentPath);
        if(!f.exists()){
            f.mkdirs();
        }
        //String fileRealPath=base+UPLOAD+newName;
        String fileRealPath=UPLOAD+newName;
        File f2=new File(fileRealPath);
        if(f2.exists()){
            f2.delete();
        }
        try {
            file.transferTo(f2);
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        String webPath=UPLOAD+newName;
        respon.setCode(Constant.CODE_SUCCESS);
        respon.setMsg(Constant.CODE_SUCCESS_STRING);
        respon.setData(webPath);
        return respon;
    }
}